XXIO is a premium Japanese golf equipment brand established in 2000 under Dunlop Sports Co. Ltd., which later became part of SRI Sports Ltd. The brand's name combines the Roman numeral for 21 (XXI) and the Japanese character "O," symbolizing "king" or "leader," reflecting its ambition to lead the golf industry in the 21st century. XXIO specializes in lightweight, high-performance golf clubs designed for golfers with moderate swing speeds. Their product lineup includes drivers, fairway woods, hybrids, irons, golf balls, and accessories. Notably, XXIO clubs feature advanced technologies such as Weight Plus, which adds weight to the grip end to enhance swing stability and reduce fatigue.